—Listen! Can you hear ______?
—Yes, I can hear a bird ______ in the tree.
| A．anything, sing | B．something, singing |
| C．anything, singing | D．something, sing |
—Listen! Can you hear ______?
—Yes, I can hear a bird ______ in the tree.
| A．anything, sing | B．something, singing |
| C．anything, singing | D．something, sing |
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